A mixture of sodium oxide, Na2O, and barium oxide,BaO, that weighted 5.00g was dissolved in water. The resulting solution was treated with excess dilute sulfuric acid, H2SO4. Sulfuric acid converted the oxides to sulfates and barium sulfate precipitated from the solution. Sodium sulfate is soluble and remained in the solution.
The precipitate was filtered, dried and found to weigh 3.43g.
What percentage of the original sample was sodium oxide.